High-opacity inorganic black pigment with excellent weatherability and chemical resistance — ideal for coatings, inks, plastics and textile applications.
Ferroferric oxide, chemical formula Fe3O4. Commonly known as the iron oxide black, magnets, magnet, black iron, with the black crystal magnetic, so it is also called magnetic iron oxide.
Iron Oxide Black 318 is produced by controlled oxidation and milling to achieve narrow particle size distribution for uniform dispersion. It offers very low organic impurities and is optimized for mechanical stability during compounding and milling.
Coatings: 1–8% by weight; Plastics: 0.5–4% depending on shade & opacity required; Inks: 5–12% paste concentration.
Iron Oxide Black 318 is a common iron oxide pigment used in developing building materials, paints, rubber, asphalt, sports racetracks, paper, plastic and others.
| Density(g/cm3) | 4.5 |
| Appearance | Black powder |
| Content of Fe2O3 % | 90 min |
| PH Value | 5.0-8.0 |
| Oil Absorption | 15-25 |
| Residue on 320 mesh,% | 0.5 max |
| Water soluble, % | 0.5 max |
| Volatile at 105 degree | 1.5 max |
| Tinting strength, % | 98-102 |
Note:The data contained here are based on our current knowledge and experience. It is the responsibility of user to test our products before the final application.
For optimum tinting strength, pre-wet the pigment with a polar carrier (for solvent systems) or a recommended wetting/dispersing additive (for waterborne systems) before high-shear milling. Aim for a final D50 in the 0.2–0.5 µm range. Use three-roll milling for inks and high-shear rotor-stator mixers for large-scale coatings. Avoid extended high-temperature milling which can cause slight agglomeration and reduce effective surface area.
Iron Oxide Black 318 delivers superior inorganic weatherfastness compared with typical carbon blacks in many outdoor coating applications. Under accelerated xenon arc testing (ISO 11507 / ASTM G155 equivalent), it shows minimal color shift and maintains adhesion and gloss retention when formulated correctly. For critical exterior systems, combine with UV stabilizers and biocides as part of the full coating formulation.
Yes — Iron Oxide Black 318 is compatible with PE, PP, ABS and other commodity thermoplastics. It tolerates typical extrusion and injection molding temperatures up to ~260°C for short residence times. For higher-temperature engineering polymers, test for thermal stability and conduct pre-conditioning steps. Use recommended anti-scatter agents or lubricants to improve flow and dispersion in masterbatch production.
